Here are a few tips from our our friends at Mr. Rooter Plumbing in Washington:
Start with a bead of silicone caulk around the sink’s strainer hole and underneath the strainer’s lip.
Tip 1 Push the strainer into the caulk (remove the excess later).
Tip 2 From underneath, insert the rubber gasket and cardboard washer, if any.
Tip 3 From on top, insert the open jaws of needle-nose pliers through the holes.
Tip 4 From underneath, tighten the nut with a spanner wrench with one hand while keeping the strainer from turning with the pliers.
Tip 5 If the strainer nut is designed for it, lock it with the supplied bolts.
BONUS TIP: Thread on the strainer nut, hand tight. Then, tighten the nut with the spanner wrench.
OR . . . Just call me at 615-306-0375 and I’ll do it for you!